/Engine/Source/Runtime/Core/Public/Delegates/DelegateSignatureImpl.inl
Execute the delegate, but only if the function pointer is still valid
Returns true if the function was executed
template<typename DummyRetValType, std::enable_if_t< std::is_void< DummyRetValType >::value > &42;> bool ExecuteIfBound &40; ParamTypes... Params &41; const